Lamp-lock guard



C. W. TRULOCK.

I LAMPLOCK GUARD. APPLICATION FILED APR.23. 1921.

1,414,906. Patented May2,'1922.

CHARLES W. TRULCCK, 033 LOS ANGELES, CALIFORNIA.

LAIMP-LOCK GUARD.

Application filed April 23, 1921.

T 0 all whom it may concern:

Be it known that 1, CHARLES W. TRU- LOCK, a citizen of the UnitedStates, residing at Los Angeles, in the county of Los Angeles and Stateof California, have invented new and useful Improvements in Lamp- LockGuards, of which the following is a specification.

This invention is a device for locking usual electric lamps in theirsockets and consists of a guard member received over the lamps so as toprotect the same and lock around the socket of the lamp.

The invention will be readily understood from the following descriptionof the accompanying drawings, in which Figure 1 is a plan view of adevice constructed in accordance with the invention.

Fig. 2 is a side elevation of the same in locked position.

Fig. 8 is a similar view showing the device swung open so as to bereceived over the lamp.

Fig. 4 is a longitudinal section through a device constructed inaccordance with the invention and showing the same in operative positionupon a lamp socket.

Fig. 5 is a detail longitudinal section through the locking collar ofthe device.

Fig. 6 is a detail transverse section on the line 66 of Fig. 2, and

Fig. 7 is a perspective view of the key employed for unlocking thedevice.

The improved locking guard is employed in connection with a usualelectric lamp 1 threaded into a usual lamp socket 2, which preferablyincludes an annular shoulder 3 and an annular groove 4.

The locking guard is a cage adapted to be received over the lamp andcomprising two co-operating cage members 5 hinged together at one end,as shown at 6, and carrying half collars 7 at their opposite end so thatwhen the cage is received over the lamp and the two cage members areswung toward one another and into position enclosing the lamp the twohalf collars will form an annulus received around the socket member 2.

The half collars 7 are preferably provided with an inwardly extendingcircumferential rib 8 adapted to be received beneath the shoulder 3 ofthe socket member and the ends of the half collars form an inwardlyextending annular flange 9 adapted to engage in the annular groove 4: ofthe Specification of Letters Patent.

Patented May 2, 1922.

Serial No. 464,004.

socket member. By this arrangement it will be seen. that when the halfcollars are locked together that the guard member is held againstremoval from the lamp socket and as a consequence an adequate protectoris formed for the lamp and it is impossible to remove the lamp from itssocket.

The means employed for locking the half collars consist of lugs 10projecting from the inner surfaces of the half collars at opposlte endsof the same, and co-operating tongue members 11 secured to the innersurfaces of the half collars at the opposite ends of the same which areadjacent the lugs 10. The tongues may be secured to the half collars byrivets 12 and the projecting ends of the tongues overlie lugs 10 and areprovided with openings 13 adapted to receive said lugs. It will thus beseen that when the half collars are swung toward one another that lugslOwill automatically. engage in openings 13 and thereby lock the halfcollars in closed position.

The joints at the meeting ends of the half collars may be protected byextending the ends of the half collars carrying tongues 11 so as to formlaterally oifset'portions 14: adapted to be received over the ends ofthe half collars carrying lugs 10, and as clearly shown in Fig. 6. Withthe half collars thus automatically locked in closed position it isimpossible to disengage the half collars until the following describedunlocking mechanism is actuated:

This unlocking mechanism includes an opening 16 formed in one of thehalf collars adjacent the end thereof carrying the lug 10 so as to bealongside of the end of tongue 11 when the half collars are unlocked. Abarrel 17 is rotatable in opening 16, the ends of the barrel beingenlarged as shown at 18 so as to engage the respective surfaces of thehalf collar and thereby prevent aXial displacement of the barrel whilepermitting of the ready rotation of the same. A radial slot 20 is formedin this barrel and a slot 21 is formed in the half collar so that whenthe barrel is rotated to the proper position slots 20 and 21 will alineto form a key opening. The slot 21 is preferably an angular slot so thatthe key opening formed by the alined slots will be of irregular shapeand thereby necessitate the employmentof a similarly shaped key forinsertion in the key opening.

The key which may be employed in conl l l and the key is then rotatedthe wedge 24 will *nga 'e beneath the end of tongue 11,

2D P, 7 shown in Fig. 0. As a result, he ton ue is pried from the end ofthe adi ll collar so as to disengage lug 1 I 4'! "I a r recess 13, andthe call collars may hen be readily swung apart, it being under toodthat when the automatic connection t on end of the half collars is thusbroken a c that the connection the opposite end 01" th halt collars willbe readily disengaged.

e The construction thus described proconvenient means for looking aguard around a. lamp and onto the socket 112 same, said locking meansautomatically engaging and being securely held 'ainst c-lisengagementuntil a suitable key inserted in the key opening and operated todisconnect the locking engagement of the guard member.

Various changes may be made without d partingfroin the spirit of theinvention as claimed.

lVhat is claimed is:

1. The combination with a lamp and socket, or a guard comprisingsections hav ing half collars co-operating to form a colla receivedaround tne socket, said half collars having overlapping ends and lug andrecess connections between the same, one of said hall collars having abearing opening, a barrel therein having a radial slot, the

said halt collar having a key slot extending beyond said barrel andadapted to aline with the radial slot, and a key having a laterallyextending operating end, said slots being arranged to receive said key,the parts being arranged for engagement by said key end of one of saidoverlapping ends of the half collars in order to pry the same apart andthereby disconnect the lug and recess connection.

2. The combination with a lamp and socket, of a guard comprisingsections having half collars co-operating to form a collar fitting thesocket, sald halt collars having overlapping ends, lugs extendinginwardly from opposite ends of the half collars, tongues secured to theopposite ends of the half collars from the lugs and having apertures toreceive the lugs so that when the half collars are pressed together thetongues will snap over the lugs and lock the collars together, and meansfor unlocking one of the tongues.

3. The combination with a lamp and socket, of a guard comprisingsections having hall? collars co-operating to form a collar fitting thesocket, said half collars having overlapping ends, lugs extendinginwardly from opposite ends of the half collars, tongues secured to theopposite ends of the half collars from the lugs and having apertures toreceive the lugs so that when the half collars are pressed together thetongues will snap over the lugs and lock thecollars together, and a keybarrel mounted inone of the half collars and adapted to receive a key toengage one of the tongues to unlock the tongue from the lug.

In testimony whereof I have signed my name to this specification.

C. lV. TRULOCK.

